Mec New Style Collet 12ga.. The MEC New Style Collet is designed as a self centering unit to fit over any standard bolt action ram cylinder or sizing dies that have collet style bolt action punches. Because the hammer forces the dies into the new style collet shape a collets weight will end up being the difference of a few lbs. Being undersized due to wear or misalignment issues many reloaders have experienced in the past. This is a common problem with reloading dies that use collet type punch adaptors. Because of this the collet adjusting cylinder must be replaced with an adjustable collet specific to the reloading die being used. Specifications for Mec New Style Collet 12ga. : Type/color: Black Size/finish: 12 ga Material: Steel Package Contents: Mec New Style Collet 12ga. The Mec New Style Collet 12ga. is a quality addition to the MEC lineup. For more great deals on Press Parts & Accessories by MEC please browse our Mec Reloading Equipment page.